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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c60a5b04fb09eac43b0dab8e1f78abc67f2b114dfa4ccc44ede7fe42a988218' 
  AND token = '9jrUH85/k2Rx437skI0EFp88LUhh38QALXiFkasWYN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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