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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d95ba739c29645741a9dc3a53ae8641f528789d40e4e045309f9bc17ca591bf' 
  AND token = 'QMWwkUyVHCHCAk4v9iyq4Zp10Gd448PSud4jwPdH96c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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