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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7933218ee24710b98542c98bcfdafac9a460169fca0029d285f3c3d8bc274361' 
  AND token = 'ibWqA4+SlB9KPNhiffe/z1gXiJXgb4PEaRs41zkXFQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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