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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019de8b902d91cde7c8f2925cfe3e4f963111c68c52f573fa4c627d82ba05f4b' 
  AND token = 'aawO1DAe7yUYw20Y1J5yJ5NW80kesC6XQrvRziEmQds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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