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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08c131832e05e3811ed1d7a478cc19d72e302d64a93199b000607f4858d4839' 
  AND token = 'vjizCS1h4BGuqbeIjNtA9KLW6NYKSNzJrAhG9Wa9fgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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