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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08de9fc44a1dc4e849e1b47677af929a8d099ddc9b4e9844d53a90eed35267af' 
  AND token = 'mFEnRka27juNuxTz4Xm54iHu1uTDTksDyEfejzl7Duo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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