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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361d1c2c139af67dfe8640fb13e9a6ef3e8c035b8fe76323bb8d4ae66347827b' 
  AND token = 'R8RsSnwHuJrCAVtlIh58AYuwmYmXIR88G6YfNu0WS+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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