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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391b5cde0e6c8e9231485e43058b2beadd62f5f145ba407fd8360ec2235c242e' 
  AND token = 'HiBeKke26wvn3+C8exmtpkEbhQ6FMNKzUnyU2THlIms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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