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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c113f27a2f228127df04bf2b1a49a5eab7c7c820fcba47003ed1610ec66d67c' 
  AND token = 'TRYGFVbgLvP83wvo3rabeWPJF8TGl0mUsvDky4GpwS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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