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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e31923a9f46bd46103767be7b0aebf35e1c46df8b4affd87411f5baf7aec493' 
  AND token = 'jkRy1vBpcphqsMZ9q04U2c1gsZga2wy6g1RRsRrsFOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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