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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9135d758ab15a3957fe53ff450b31a8754f8e8dad8dea57283121f110a521c8c' 
  AND token = 'X8sm/eCMvg7wvl/GMaTcFzAzsAzFbe1tFHP+pR0JRBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00153

JSON explain

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