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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bb77e44f3b3fe6d65a2880ca5e31ce7710d8655262d449123d5a06528154ed' 
  AND token = 'RlAIbLyvvjaSgG3yaa8IFTI9unKMXMSGee+if4KXxkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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