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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c95ab596682871aace85e0bc9d9943375cbff85e53ec674ab2d9f119b7e8c95' 
  AND token = 'KffprzCBdqLxLNp5aqEHO/xLTNxH1Rkfn+8QdKm+ero=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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