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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1e06d245f131875e82bd4282aa772ae598895dd3f219dac07b60c88b6544d9' 
  AND token = 'JtQ8TwCribYCdUSoehHe9x0g7mMPo9Zgansuy47UtU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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