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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23e4745c8456b0d761a3f20f3c6d665ff7a247598364e2ef9aae186e28bd540' 
  AND token = 'OOcaGRYni0CCy6ztTsPYLFG6t1ekh/58xALjv86fX7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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