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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1683682c954df746e419c311df846122417166867f16aa66a4aeb5eeaabf17dd' 
  AND token = '5i1MMLcLDo5iMBlzb8MUOmv6kYfLFsk7FFCpMBh7ul4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}