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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5918e86b4a7631fb8c26afcecbf06deb0b8dbf95c5309a11fce225ec53cc24' 
  AND token = '9oDXki4Qjh/3SgFCCgZuIr6WDmxhpgedb3nugVYlGqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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