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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c651559ea118afd137165beb46a7092bd1a1576cd2bb4e2413f4607a10e2be' 
  AND token = 'aeIQPkxP4udhTgBkojc9qQ2hI7mlTuNGWzW9EG/yegs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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