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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759c5a1b800708bcb5dd71565a7d75a323decd562fdafe950ce26e1ebbdd1fbb' 
  AND token = '/BFxvq89dGQrpbIvxk6IP8nEqv1yviqMbAiHjFjSk6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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