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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d3262ea523c0f098f3d07befbd44b720008e0f85b230c20fcc33e803630045' 
  AND token = 'QbXE5xheeGXv11NAMH5vsKR+XhDSoOETXJ4rX7iexw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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