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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0ec62e7bae46c6e1d9cc0a1e36625977a41e42e5a57175edd5d48226fb5f4d' 
  AND token = 'V68TNFloLAq6TMIKNVkKZOuKXBukjp1SS1rwv6pFLcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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