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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae67a2e16ae76a7e0f4f9e42921d6dc2818b09504f72dccee25ef12e26b27f02' 
  AND token = 'BqumWR2F2SRFKvIut9voAWD/y3E7yH5Ny7DxBwT8GF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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