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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc2bc51dcda5cd68118c65ed072381b34f500099150df903cb9d6b4a01189a4' 
  AND token = 'UW60efviQEeC+PRYpv++pLt9FioKqJd9ijlz/olmeQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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