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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07973758fbe38ed5b67a37f3767b247d2dd574f2e34948491666bd407b68548c' 
  AND token = 'eyZzxRx8JG8+4yZm60fZ38hTwvApH0C/RFGE0q1ScLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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