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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94456099f45b42b0a89b70595501a1bc145d4ae5d8ad971152302d8e6da74ae5' 
  AND token = 'ADOSeS6Q63176sbi6v6EfcQCM1lknWXZJ5T+YqebDqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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