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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c52c58d146c8803bd5da733907970e178bede745c20b18304af6ea340ccd89c' 
  AND token = 'mXR7gMMus8yCcusMie2maUu3IAfliZb9Oy/ff7DO7jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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