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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6016801a9f86e77741a1a5b5ece74353a201a9fa5a9fbb0273a724455a649a98' 
  AND token = 'FaVAUAFpXngMZ6R1zEjJMAkGAh4F3L/7z2Cyjlu83BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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