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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e42a7ae2ddbc2ee610e1f024a5bdaf9ad69668a76a700d4f829fe598a26e90' 
  AND token = 'T2rmIx1kkz1PKYYCvHh554A6whsP8C5ym4vX+zkMKNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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