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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e52d5ff566c8056cd0d282b3a5697f2bde75bdc8a641a6b4bb3175db31a40f' 
  AND token = '7UCT1wbXKaKP5wQeRi6j+gfsFQP/+n6utyaC7GQOnWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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