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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb355753c11007860541d8847aa54a05a44d78e7ac7a8b892b8858f6f1cfce9' 
  AND token = '/MJ8bwJRpuddZ/ooDtH7li/59YGmRJqRLr7v/2UdhaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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