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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887839304f7ac7ee0ca8bbb49e8f60a859fa327ccbd10826b2072199842a4d36' 
  AND token = 'r1fSf5bTYiflZEIWG39p1dXZaRmwfxb4vvQGr0sx2P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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