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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21c19664e9957390a6f7bd5e319c7215a8028fe7351a504b38f02ff2085e52a' 
  AND token = 'gy1NtI0N+F/Ml78dtc1TJl7zbDpgdYuwjPV3iXcbvXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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