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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad196cc0a6022e19f3423c3ee9e364dc2ae51a8091a1a21aceafdb4beef8b1d' 
  AND token = 'm6dqwCYIAhXAigqJGjfl93Rt1xTAk9dGD2cEZ0G2ZjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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