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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566c506b7cf87021f59adb35636c2e580a5d67196e307a2c0f87e2ca3cad47db' 
  AND token = 'pKWiPMMZK0LKeWpJlNV4eYFHNUCbxTgkxA+1H0sYt6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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