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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c1cb8b7920bab5dd0b48eaa74fcb91dbb7f5fdbf708d747014753360b8a6ea' 
  AND token = 'pYodJf8NJUfrTggfxMe7bmLNjqroBnOhVxvd5M964GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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