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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e2cb2b087bbc96a1948ca9ef95e9f3b206a81756354645b2c87972600047f8' 
  AND token = 'r6xW28Eca4LYBjH4CwCXez3datUa3i3Of2CERi3U/tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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