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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1ffd6146f3135ae85df7456ff81b2a207b8563f732927128129ccfeea60c7e' 
  AND token = 'nJ5anPfsPqUtepJGdKBiD3IWtGfB92SvlR9TWN71mpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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