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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6647a177d89013a3ba1bc51b8620d85426b584d0c2275e072c27aa21cb2065' 
  AND token = 'CC9BI8KoccHOW2D1WtS0R3vgJ+pIWCD8TOG7bIwaI0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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