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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c644655608d79d0257b55fd777863096a15ee17535d4be039a93fed688a83b06' 
  AND token = 'I3XC4hx+EuiHEYvLo2PabcGonaxCmpR3Ehj7Q88D8R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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