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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd972bb9b05e1c5becd6a880104847b1032a4e05eefb8d72bedc9f5e66490a5c6' 
  AND token = 'tu0xtASmUY7LyzEcuR5h6rHqvYzGvWmrB23LKDM0XeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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