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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e3aae2ad80c989bd25066513d383bee7a39487b0cd34b37e84bb3995efa63e' 
  AND token = 'hge3WMo+kLAAGhmG1N/VHBfRvuG8cw6xqziuEW/yG74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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