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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cb38ed48b333a76828b87e930fa2d55cb5db286a0146756b807bad87c3085d' 
  AND token = 'b8VHVD5DP727BpQuG4cHWqYyaHnar8AxEyH94ZK2Rf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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