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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bba4b43bddf2832a51a6e88e21347973f1778ed439cc75aff8bd59029cb5dda' 
  AND token = 'rLYyuorA07Ghu6+LZ3WlVDOynNXzvBdN9iyvYsuCu74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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