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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e1ad1f9c9d377649366dabb4d19b92a79dd3cc349011556ab3d16139824014' 
  AND token = '/82hTBfOHE8lkDrxDoDgQC0q0pdd2HFuaguWVzw9FGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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