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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64875a94a194fdd73c1eadd7c9872504df39deb474ff715e9c2ae39b5a72d994' 
  AND token = 'TLQnEuC/5X9CBk925v1G7S6kWZsnerOyVNtVB9Rka1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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