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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc7bff3bb93a39f61de805bf469c8e25fbf33ce852337c01eb3706baa9d9699' 
  AND token = 'k9EQhULEbg7l7SSlmKiPWhBC9mpflylfZ1EsETC5U6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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