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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c3f3d9f751026e0cdd014026abf6be72967f9cba3320bf48bbd9a0f0340088' 
  AND token = 'OTWXjwqz0+bjT879j/3h3CnsMyv93ldr+kusOwxS6Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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