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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dada6f3fc70ffcec00fae20b8d6c560c10aabd2b645dbef0997a80da7e8166' 
  AND token = 'LYQlqLFouW2SbqQ2RHk4dCLK8CtZ4CFlZI+4ic5cKpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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