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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811a4e108736b348bb6f961b1180bc9e4bfbe583a223a69613304876bd62b76b' 
  AND token = 'HosfdJmj1CSbcUCp2fow/6cZOfz6R5FP2L2xO+e41A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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