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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc79512233a2a0e241476e92389acd3f7383f6af89a2904b32a7af5671a1cb4' 
  AND token = 'WSFVr7jTHVNsCgprddNFuvaDIsAn288KbX2OrUm+//o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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