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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa2f5e6a2bcc2558b8a3a7aecc1d0aeecc93f5b2283302c23cd8c6a875bdebf' 
  AND token = 'QyNgzxQaDwaqUUpu6PVFCjSc2l2s2RxXiuUNdAdtEXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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