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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960a12cd9899970aa61098f4030072943be12b8041b91f478919ae67bc0f3bf5' 
  AND token = 'F7bM0Xx7dw+dOBh5A7kLQCMwI+13ezzt9TEw9Gb6nlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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