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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b112042f28ffdf0582c6a0f99bb3a711855dc8f98a3ba5e75a79ed146c3c7d6' 
  AND token = 'Xo64DVyKieno0PeNRmrVE8U8ijvYGxNr7USFRKzn1RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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