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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9fc4e7300d7458adceeeb4b933c3e291c90041a4557b0460fd4e1b69d58708' 
  AND token = 'Zo7gdKXUQl8cw3/UQkxSl+oA62awW3+tiph6RBRn43M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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