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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d3c1c85f2337710fa636212f5a1e433dfd6330b30c462a17006c6050c61729' 
  AND token = 'zDDegkApZWU7BBqi39GdptNYdO6K7zvQ75gAW+ur6WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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